[jdk17u-dev] RFR: 8306135: Clean up and open source some AWT tests

[Goetz Lindenmaier]

I backport this for parity with 17.0.9-oracle.

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Commit messages:
 - Backport 4ad3ac6317f6fc95fdf0340885d4099e785132ad

Changes: https://git.openjdk.org/jdk17u-dev/pull/1509/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1509&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306135
  Stats: 360 lines in 3 files changed: 360 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1509.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1509/head:pull/1509

PR: https://git.openjdk.org/jdk17u-dev/pull/1509